Answer
$3.86$ square units
Work Step by Step
By definition: $K=\frac{ab\cdot \sin(C)}{2}.$
Hence, here
$K=\frac{3\cdot4\cdot \sin(40^o)}{2}\approx3.86.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 8 - Applications of Trigonometric Functions - 8.4 Area of a Triangle - 8.4 Assess Your Understanding - Page 544: 15
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